Explain about colour modes in Adobe Photoshop?
https://www.computersprofessor.com/2019/04/explain-about-colour-modes-in-adobe.html
Explain about colour modes in Adobe Photoshop?
The color mode
or image mode determines how colors combine based on the number of channels in
a color model. Different color modes result in different levels of color detail
and file size. For instance, use CMYK color mode for images in a full-color
print brochure, and use RGB color mode for images in web or e-mail to reduce
file size while maintaining color integrity. The most commonly used colour
modes are explained below:
v
RGB (RED GREEN BLUE) mode:
Photoshop RGB Color mode uses the RGB model, assigning an intensity value
to each pixel. In 8-bits-per-channel images, the intensity values range from 0
(black) to 255 (white) for each of the RGB (red, green, blue) components in a
color image. For example, a bright red color has an R value of 246, a G value
of 20, and a B value of 50. When the values of all three components are equal,
the result is a shade of neutral gray. When the values of all components are
255, the result is pure white; when the values are 0, pure black.
v
CMYK (CYAN MAGENTA YELLOW BLACK) mode:
In the CMYK mode, each pixel is assigned a percentage value for each of
the process inks. The lightest (highlight) colors are assigned small
percentages of process ink colors; the darker (shadow) colors higher
percentages. For example, a bright red might contain 2% cyan, 93% magenta, 90%
yellow, and 0% black. In CMYK images, pure white is generated when all four
components have values of 0%.
v
Index mode:
Indexed Color mode produces 8-bit image files with up to 256 colors. When
converting to indexed color, Photoshop builds a color lookup table (CLUT),
which stores and indexes the colors in the image. If a color in the original image
does not appear in the table, the program chooses the closest one or uses
dithering to simulate the color using available colors.
v
Gray scale mode:
Gray scale mode uses different shades of gray in an image. In 8-bit
images, there can be up to 256 shades of gray. Every pixel of a gray scale
image has a brightness value ranging from 0 (black) to 255 (white). In 16-and
32-bit images, the number of shades in an image is much greater than in 8-bit
images. Gray scale values can also be measured as percentages of black ink
coverage (0% is equal to white, 100% to black)
v
Bitmap mode:
Bitmap mode uses one of two color values (black or white) to represent
the pixels in an image. Images in Bitmap mode are called bitmapped 1-bit images
because they have a bit depth of 1.